The 1927 crisis of the Chinese Revolution coincided with a crisis in Russia, and in the Comintern, expressed in the struggle between Trotskyism and Stalinism for theoretical and practical control of Russia.
想请教一下老师这里的coincided和expressed我们可以从句意上(基于历史知识)大体判断出谁是谓语动词还是过去分词,如果本身对这段历史是未知的,那么从语法上面如何准确快速地判断这两个谁是谓语谁是非谓语呢?